Introduction
This manual provides essential information for the safe and efficient operation, installation, and maintenance of your Reznor UDXC-45 Natural Gas Unit Heater. Please read this manual thoroughly before installation or use and retain it for future reference. This unit is designed for indoor use in commercial, industrial, or residential spaces such as garages, workshops, and warehouses.
Safety Information
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death. Read the installation, operating, and maintenance instructions thoroughly before installing or servicing this equipment.
- Installation must comply with local and state codes. It is highly recommended that installation and service be performed by a qualified installer, service agency, or gas supplier.
- Ensure adequate ventilation in the installation area.
- Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
- This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Product Features
- Heating Capacity: 45,000 BTU with two heating output levels (low fire 26,145 BTU / high fire 37,350 BTU).
- Thermal Efficiency: Achieves an 83% thermal efficiency rating.
- Heat Exchanger: TCORE2 titanium-stabilized aluminized steel heat exchanger for durability.
- Combustion: Patented single-burner combustion system.
- Control System: Integrated circuit board with a 7-segment display for simple troubleshooting, built-in disconnect, and status-indicating LED.
- Fan System: Quiet operation with a vibration/noise isolated low static pressure axial propeller fan and power venting system.
- Mounting: Threaded-nut retainers at four suspension points for ceiling or wall mounting (mounting hardware sold separately).
- Design: Improved cabinet design with a removable front face and a hinged access door panel with a quarter-turn latch.
- Certifications: ETL Approved. All UDXC sizes are certified for Commercial/Industrial Use. 30K-120K BTU units also approved for Residential Garages & Workshops.
Figure 1: Key features of the Reznor UDXC-45 Unit Heater, highlighting 83% AFUE Efficiency, Multi-Try Direct Spark Ignition, TCORE2 Heat Exchanger, and Low Noise Operation.
Figure 2: Additional standard features including Status-Indicating LED Light, 7-Segment Display Board for Troubleshooting, 2- and 4-Point Suspension Options, External Gas Connection, and ETL Approval.
Setup and Installation
Proper installation is crucial for the safe and efficient operation of your Reznor UDXC-45 heater. It is strongly recommended that installation be performed by a certified HVAC professional or gas technician.
Mounting
- The unit is designed for ceiling or wall mounting. It includes threaded-nut retainers at four suspension points.
- Mounting brackets and hardware are sold separately and must be appropriate for the unit's weight and the structural integrity of the mounting surface.
- Ensure the unit is installed in a location that allows for proper air circulation and access for maintenance.
Venting
- The unit is compatible with Category 1 double wall B-vent when venting vertically out of a roof.
- Alternatively, it can be vented horizontally through a sidewall using Category 3 single wall vent pipe.
- All venting must comply with local building codes and manufacturer specifications.
Figure 3: Overview of simplified installation features, including updated cabinet structure, hinged access panel, and suspension points for mounting.
Operating Instructions
The Reznor UDXC-45 heater is designed for user-friendly operation. Ensure all gas and electrical connections are securely made and checked by a professional before initial startup.
Starting the Heater
- Verify that the gas supply valve to the unit is open.
- Ensure the electrical power to the unit is turned on.
- Set your thermostat to the desired temperature. The unit will automatically cycle on and off to maintain the set temperature.
Heating Output Levels
The UDXC-45 features two heating output levels for optimal efficiency:
- Low Fire (26,145 BTU): Suitable for milder cool days, providing efficient heating without excessive energy consumption.
- High Fire (37,350 BTU): Engages for colder temperatures, ensuring rapid and effective heating of the space.
Quiet Operation
The unit operates quietly due to its vibration/noise isolated low static pressure axial propeller fan and power venting system. This design minimizes operational noise, making it suitable for environments where sound levels are a consideration.
Figure 4: The Reznor UDXC shop heater's single-burner design offers two BTU outputs for efficient heating in any weather.
Figure 5: The low static pressure axial fan and power venting system ensure optimal air circulation and reduce heat loss.
Video Demonstration: Quiet Operation
This video demonstrates the quiet operation of the Reznor UDXC-45 heater, showcasing the minimal noise produced by the fan during operation. This is particularly useful for environments like workshops or garages where noise levels are a concern.
Video: Hear the quiet operation of the Reznor UDXC-45 heater.
Maintenance
Regular maintenance ensures the longevity and optimal performance of your Reznor UDXC-45 heater. It is recommended that all maintenance be performed by a qualified service technician.
- Annual Inspection: Have the unit inspected annually by a qualified technician to check for proper operation, gas connections, venting, and overall condition.
- Cleaning: Keep the area around the heater clear of obstructions and debris. Periodically clean the exterior of the unit.
- Heat Exchanger: The TCORE2 titanium-stabilized aluminized steel heat exchanger is built for durability, but regular checks for any signs of wear or damage are advisable during professional inspections.
- Access: The improved cabinet design with a removable front face and a hinged access door panel with a quarter-turn latch simplifies access for maintenance.
Troubleshooting
If your Reznor UDXC-45 heater is not operating as expected, refer to the following general troubleshooting steps. For complex issues, always contact a qualified service technician.
- No Heat/Unit Not Starting:
- Check if the gas supply valve is open.
- Verify that the electrical power to the unit is on.
- Ensure the thermostat is set to a temperature higher than the ambient room temperature.
- Check the status-indicating LED and the 7-segment display board for error codes, which can assist in diagnosing the issue.
- Unusual Noises:
- Ensure the unit is securely mounted and free from vibrations.
- Contact a technician if unusual noises persist, as it may indicate an issue with the fan or other internal components.
- Insufficient Heating:
- Confirm the unit is operating on the appropriate fire level for the ambient temperature.
- Check for any obstructions in the air intake or exhaust vents.
Specifications
| Attribute | Value |
|---|---|
| Brand | Reznor (1HVAC) |
| Model Number | UDXC-45 |
| Fuel Type | Natural Gas |
| Heat Output (High Fire) | 37,350 British Thermal Units |
| Heat Output (Low Fire) | 26,145 British Thermal Units |
| Thermal Efficiency | 83% |
| Indoor/Outdoor Usage | Indoor |
| Mounting Type | Ceiling Mount / Wall Mount (with separate brackets) |
| Product Dimensions | 29.75"D x 27"W x 13.75"H |
| Item Weight | 60.9 pounds |
| Number of Speeds | 2 |
| Special Feature | Fast Heating, Quiet Operation |
Figure 6: Physical dimensions of the 45,000 BTU Reznor unit heater.
Warranty and Support
Warranty Coverage
The Reznor UDXC-45 heater comes with the following warranty coverage:
- 9 Year Warranty: Heat Exchanger, Burner, and Flue Collection Box Assembly.
- 4 Year Warranty: All Electrical and Mechanical Components.
To ensure a valid warranty, installation must comply with all local and state codes.
Customer Support
For technical assistance, warranty claims, or service inquiries, please contact the manufacturer's authorized service center or your original point of purchase. Always provide your model number (UDXC-45) and serial number when contacting support.
